Eyeglasses.



No. 706,899. Patented Aug. I2, I902.

J. CARTER.

EYEGLASSES.

(Application filed Jan. 10, 1902.)

(N9 Modl.)

WITNESSES: INVENTOH vE/zn 622K267 m: NORRIS PETIHS co.,FHOTC-L\THU.WASHINGTON, o. c

UNi'rnn Starts .ATENT rricn.

.TOIIN CARTER, OF MALDEN, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ALFREDG. CARTER, OF MALDEN, MASSACHUSETTS.

EYEGLASSES.

SPECIFICATION forming part of Letters Patent No. 706,899, dated August12, 1902.

Application filed January 10. 1902. Serial No. 89,142. (No model.

To all whom, it may concern.-

Be it known that 1, JOHN CARTER, a citizen of the United States, and aresident of Malden, in the county of Middlesex and State of 5Massachusetts, have invented new and useful Improvements inEyeglassesfof which the following is a full, clear, and exactdescription.

This inventionrelates to a means for fas- I toning the spring and guardto the stud of eyeglasses, and particularly to a device for preventingthe accidental loosening of the screw which is employed to effect theconnection.

I This specification is a specific description of one form of theinvention, while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, formingapart ofthis specification,

in which similar characters of reference indicate corresponding parts inall the views.

Figure 1 is a fragmentary elevation illustrating the invention. Fig. 2is an enlarged sectional view looking toward the head of the screw onthe stud. Fig. 3 is a section on the line 3 3 of Fig. 2, and Fig. 4 is adetail perspective view of the screw-lock.

ct indicates the lens; I), the spring; 0, the guard, and d the stud,which latter element 0 is fastened to the lens and carries the springand guard. On the stud d are formed the usual flanges d and Of theseflanges the latter is shortened for apurpose which will be fullydescribed hereinafter. In some forms 5 of construction both flanges areshort and of equal height. My invention is applicable to either form.Between the flanges d and (Z the ends of the spring b and of the shank cof the guard c are placed. 6 indicates the screw for holding these partsin position.

This screw is prevented from becoming accidentally loosened by means ofthe screwlockf, which constitutes the important feature of my invention.This screw-lock is in the form of a plate with a diagonal slot f thereinwhich receives the shank of the screw. The plate is also formed on itsinner end adjacent to oneedge with a groove f receiving the shortenedflange d of the stud d, and at the edge to which this groove f isadjacent are formed inwardly-bent flanges or teeth f which lie againstthe outer side of the flange (1 The parts being constructed and arrangedas shown and the screw 6 being tightened, it will be observed that thescrew-lock f will be held firmly and reinovably in place on the stud andthat idlemovement of the parts will be prevented. It is this idlemovement that loosens the screw,-and by means of my invention theloosening of the screw is avoided.

The screw-lock of theform shown may be readily adjusted to the size andshape of the stud, and is therefore applicable to any eyeglasses withthe parts as previously constructed, excepting, of course, that theflange d must be fitted to the screw-lock. The diagonal slot f enablesthe screw-lock to be readily adjusted with respect to the screw, and italso bears. against the shank of the screw and prevents upward ordownward 7o movement of the lock. (See Fig. 2.) By providing the twoflanges orlteeth f in place of a continuous flange' on the screw-lockboth of the flanges or teeth f may be made to bear on the flange of thestud, notwithstanding that said flange maybe curved.

Various changes in the form and details of my invention may be resortedto at will. without departing from the spirit of myinvention. Hence Iconsider myself entitled to all forms of the invention as may lie withinthe intent of my claims.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A screw-lock for eyeglasses, comprising a platehaving a slot formed therein to receive the shank of the screw, a groovein the inner face of said plate adjacent to one edge, and aninwardlyextending flange at said edge, as set forth.

2. A screw-lock for eyeglasses, comprising a plate having a diagonalslot formed therein to receive the screw, and a groovein the inner faceof the said plate adjacent to'one edge, as set forth.

3. A screw-lock for eyeglasses, comprising an eyeglass-stud havingflanges, a plate with a diagonal slot therein, said plate havingadjacent to one edge a groove to receive the adjustingestud flange, andthe plate also having a laterally-turned tooth or flange adjacent to thegroove, the tooth or flange lying on the outside of the flange ot' thestud of the eyeglasses. I 1

4. The combination with an eyeglass-stud having flanges, of a screw-lockcomprising a plate having a diagonal slot therein to receive the shankof the fastening-screw, the said plate being provided with a groove inits inner face adjacent to one edge and extending from the top to thebottom of the plate and adapted to receive one of the stud-flanges, thesaid plate being further provided with an inwardly-bent flange at theedge adjacent to the groove, as set forth.

5. The combination with the eyeglass-stud having flanges adapted toreceive between them the ends of the spring and guard-shank,

one of said flanges being shorter than the other, of a screw-lockcomprising a plate having a diagonal slot to receive the screw, the saidplate being provided with a groove in its inner face adjacent to oneedge to receive the shorter flange of the stud, the plate having at saidedge inwardly-bent flanges or teeth adapted to engage the outer side ofthe shorter flange of the stud, the opposite edge of the said plateextending at the inner side of the longer flange of the stud, as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN CARTER.

Witnesses:

JOHN CARTER, Six, HUGH H. CARTER.

